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Finding the Fourth Proportional to 821.88, 1,230.39 and 496.26

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Solution

The fourth proportional to 821.88, 1,230.39 and 496.26 is: 742.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.88 : 1,230.39 = 496.26 : x
  2. Step 2: Convert to fraction form
    821.88/1,230.39 = 496.26/x
  3. Step 3: Cross multiply
    821.88x = 1,230.39 × 496.26
  4. Step 4: Simplify right side
    821.88x = 610,593.34
  5. Step 5: Solve for x
    x = 610,593.34/821.88
  6. Step 6: Final answer
    x = 742.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.